i386/linux/linux-2.3.21/arch/sparc64/kernel/auxio.c

   1 /* auxio.c: Probing for the Sparc AUXIO register at boot time.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   4  */
   5
   6 #include <linux/config.h>
   7 #include <linux/stddef.h>
   8 #include <linux/kernel.h>
   9 #include <linux/sched.h>
  10 #include <linux/smp.h>
  11 #include <linux/init.h>
  12 #include <linux/delay.h>
  13 #include <linux/ioport.h>
  14
  15 #include <asm/oplib.h>
  16 #include <asm/io.h>
  17 #include <asm/auxio.h>
  18 #include <asm/sbus.h>
  19 #include <asm/ebus.h>
  20 #include <asm/fhc.h>
  21
  22 /* Probe and map in the Auxiliary I/O register */
  23 unsigned char *auxio_register;
  24
  25 void __init auxio_probe(void)
  26 {
  27         struct linux_sbus *bus;
  28         struct linux_sbus_device *sdev = 0;
  29         struct linux_prom_registers auxregs[1];
  30
  31         for_each_sbus(bus) {
  32                 for_each_sbusdev(sdev, bus) {
  33                         if(!strcmp(sdev->prom_name, "auxio")) {
  34                                 break;
  35                         }
  36                 }
  37         }
  38
  39         if (!sdev) {
  40 #ifdef CONFIG_PCI
  41                 struct linux_ebus *ebus;
  42                 struct linux_ebus_device *edev = 0;
  43                 unsigned long led_auxio;
  44
  45                 for_each_ebus(ebus) {
  46                         for_each_ebusdev(edev, ebus) {
  47                                 if (!strcmp(edev->prom_name, "auxio"))
  48                                         goto ebus_done;
  49                         }
  50                 }
  51         ebus_done:
  52
  53                 if (edev) {
  54                         led_auxio = edev->resource[0].start;
  55                         outl(0x01, led_auxio);
  56                         return;
  57                 }
  58 #endif
  59                 if(central_bus) {
  60                         auxio_register = NULL;
  61                         return;
  62                 }
  63                 prom_printf("Cannot find auxio node, cannot continue...\n");
  64                 prom_halt();
  65         }
  66
  67         prom_getproperty(sdev->prom_node, "reg", (char *) auxregs, sizeof(auxregs));
  68         prom_apply_sbus_ranges(sdev->my_bus, auxregs, 0x1, sdev);
  69         /* Map the register both read and write */
  70         auxio_register = (unsigned char *) sparc_alloc_io(auxregs[0].phys_addr, 0,
  71                                                           auxregs[0].reg_size,
  72                                                           "auxiliaryIO",
  73                                                           auxregs[0].which_io, 0x0);
  74         TURN_ON_LED;
  75 }